A device designed to determine the appropriate size and placement of an implant for a patient prior to or during surgery. It is typically available as a graduated set or an individual plate (e.g., a translucent plastic sheet or a cut metal shape) with patterns/sizes corresponding to the size of the implant to be used to aid the surgeon in final selection of implant size, placement, and/or adaption. It is used for, e.g., total- or partial-joint prostheses, bone fracture fixation implants (plates, nails, including skull plate implants) or other types of surgical implants. This is a reusable device.